Hello CMUCL list, Code like this: (ignore-errors (cffi:defcfun ("SSL_CTX_set_default_verify_dir" ssl-ctx-set-default-verify-dir) :int (ctx :pointer))) fails despite ignore-errors if the foreign function is absent (the libssl.so version loaded doesn't have it). It fails when the fasl file containing this code is loaded: KERNEL:SIMPLE-PROGRAM-ERROR: Undefined foreign symbol: "SSL_CTX_set_default_verify_dir" I wanted to look in the manual, but the manual links provided at https://www.cons.org/cmucl/doc/index.html are broken (e.g. http://common-lisp.net/project/cmucl/doc/cmu-user/, http://common-lisp.net/project/cmucl/doc/cmu-user-html.tgz) The same failure even if we modify the code this way: (when nil (cffi:defcfun ("SSL_CTX_set_default_verify_dir" ssl-ctx-set-default-verify-dir) :int (ctx :pointer))) Is there a way to not fail when the function is absent? Best regards, - Anton